/* ==========================================================================
   Base64 编解码工具 - 紧凑现代主题 (与 yst-tool-shell 协同)
   命名前缀: .b64-*
   ========================================================================== */

/* -------- 页面标题区 -------- */
.b64-page-header {
    margin-bottom: 16px;
}
.b64-page-title {
    font: 700 28px/1.2 var(--yst-font);
    letter-spacing: var(--yst-letter-spacing);
    color: var(--yst-text);
    margin: 0 0 8px;
}
.b64-page-desc {
    font-size: 14px;
    color: var(--yst-text-2);
    letter-spacing: var(--yst-letter-spacing);
    margin: 0 0 14px;
}
.b64-feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.b64-tag {
    display: inline-flex;
    align-items: center;
    height: 22px;
    padding: 0 9px;
    background: var(--yst-bg-subtle);
    border: 1px solid var(--yst-border);
    border-radius: 5px;
    color: var(--yst-text-muted);
    font: 600 11px/1 var(--yst-font-mono, "SF Mono", "Monaco", monospace);
    letter-spacing: 0.5px;
    text-transform: lowercase;
}

/* -------- 加载中 -------- */
.b64-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 0;
    color: var(--yst-text-muted);
}
.b64-spinner {
    width: 40px; height: 40px;
    border: 3px solid var(--yst-border);
    border-top-color: var(--yst-brand);
    border-radius: 50%;
    animation: b64-spin 0.8s linear infinite;
    margin-bottom: 12px;
}
@keyframes b64-spin {
    to { transform: rotate(360deg); }
}

/* -------- 区块标题栏 -------- */
.b64-section-header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px dashed var(--yst-border);
}
.b64-section-label {
    font: 700 15px var(--yst-font);
    letter-spacing: var(--yst-letter-spacing);
    color: var(--yst-text);
}
.b64-section-desc {
    font-size: 12px;
    color: var(--yst-text-muted);
    letter-spacing: var(--yst-letter-spacing);
}

/* -------- 主功能卡片 -------- */
.b64-format-card,
.b64-section,
.b64-info {
    padding: 18px 20px;
    margin-bottom: 14px;
}

/* -------- 格式选择按钮组 -------- */
.b64-format-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.b64-fmt-btn {
    height: 36px;
    padding: 0 18px;
    background: linear-gradient(180deg, #fff 0%, #f5fafa 100%);
    border: 1.5px solid var(--yst-border-strong);
    border-radius: 8px;
    color: var(--yst-text-2);
    font: 600 13px/1 var(--yst-font);
    letter-spacing: var(--yst-letter-spacing);
    cursor: pointer;
    transition: all .15s;
    box-shadow: 0 1px 0 rgba(15,23,42,.04);
}
.b64-fmt-btn:hover {
    border-color: var(--yst-brand);
    color: var(--yst-brand);
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(0, 158, 148, 0.15);
}
.b64-fmt-btn.active {
    background: linear-gradient(180deg, var(--yst-brand) 0%, var(--yst-brand-hover) 100%);
    border-color: var(--yst-brand-hover);
    color: #fff;
    box-shadow: 0 3px 8px rgba(0, 158, 148, 0.32), inset 0 1px 0 rgba(255,255,255,0.2);
}

/* -------- 左右两栏布局 -------- */
.b64-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}
@media (max-width: 1023px) {
    .b64-split { grid-template-columns: 1fr; }
}

/* -------- 单栏 (输入/输出) -------- */
.b64-pane {
    display: flex;
    flex-direction: column;
    background: var(--yst-bg-subtle);
    border: 1px solid var(--yst-border);
    border-radius: 8px;
    padding: 12px;
    min-height: 320px;
}

/* -------- pane header -------- */
.b64-pane-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}
.b64-pane-label {
    font: 700 13px var(--yst-font);
    color: var(--yst-text);
    letter-spacing: var(--yst-letter-spacing);
}
.b64-pane-label-result {
    color: var(--yst-brand);
}
.b64-empty-tag {
    font: 11px/1 var(--yst-font-mono, monospace);
    color: var(--yst-text-light);
    padding: 2px 8px;
    background: #fff;
    border: 1px solid var(--yst-border);
    border-radius: 999px;
}

/* -------- 文本/文件 切换标签 -------- */
.b64-mode-tabs {
    display: inline-flex;
    background: #fff;
    border: 1px solid var(--yst-border);
    border-radius: 6px;
    padding: 2px;
    gap: 2px;
}
.b64-mode-tab {
    height: 24px;
    padding: 0 10px;
    background: transparent;
    border: none;
    border-radius: 4px;
    color: var(--yst-text-muted);
    font: 600 11px/1 var(--yst-font);
    letter-spacing: var(--yst-letter-spacing);
    cursor: pointer;
    transition: all .15s;
}
.b64-mode-tab:hover {
    color: var(--yst-brand);
}
.b64-mode-tab.active {
    background: var(--yst-brand);
    color: #fff;
}

/* -------- 编辑器外框 -------- */
.b64-editor-wrap {
    flex: 1;
    background: #fff;
    border: 1.5px solid var(--yst-border);
    border-radius: 6px;
    overflow: hidden;
    transition: border-color .15s, box-shadow .15s;
    margin-bottom: 8px;
    min-height: 180px;
}
.b64-editor-wrap:focus-within {
    border-color: var(--yst-brand);
    box-shadow: 0 0 0 3px rgba(0, 158, 148, 0.12);
}
.b64-editor {
    width: 100%;
    height: 100%;
    min-height: 180px;
    padding: 10px 12px;
    border: none;
    outline: none;
    background: transparent;
    color: var(--yst-text);
    font: 13px/1.6 var(--yst-font-mono, "SF Mono", "Monaco", monospace);
    resize: vertical;
    word-break: break-all;
}
.b64-editor::placeholder {
    color: var(--yst-text-light);
    font-style: italic;
}
.b64-editor[readonly] {
    background: #fafafa;
}

/* 占位空状态 */
.b64-editor-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--yst-text-light);
    font-size: 13px;
    text-align: center;
    background: #fafafa;
    padding: 30px 20px;
}

/* -------- 文件拖放区 -------- */
.b64-dropzone {
    flex: 1;
    min-height: 180px;
    margin-bottom: 8px;
    background: #fff;
    border: 2px dashed var(--yst-border-strong);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    transition: all .15s;
}
.b64-dropzone.is-dragover {
    background: var(--yst-brand-soft);
    border-color: var(--yst-brand);
    border-style: solid;
}
.b64-dropzone-icon {
    width: 48px; height: 48px;
    color: var(--yst-text-light);
    margin-bottom: 8px;
}
.b64-dropzone-icon svg { width: 100%; height: 100%; }
.b64-dropzone-text {
    font: 13px var(--yst-font);
    color: var(--yst-text-muted);
    margin: 0 0 12px;
}
.b64-file-input {
    display: none;
}
.b64-file-name {
    margin-top: 10px;
    font: 600 12px var(--yst-font-mono, monospace);
    color: var(--yst-brand);
    word-break: break-all;
}

/* -------- 状态 pill -------- */
.b64-stats {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}
.b64-stat-pill {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    height: 22px;
    padding: 0 9px;
    background: #fff;
    border: 1px solid var(--yst-border);
    border-radius: 999px;
    font: 500 11px/1 var(--yst-font);
    color: var(--yst-text-2);
    letter-spacing: 0.3px;
}
.b64-stat-pill strong {
    color: var(--yst-brand);
    font-weight: 700;
    font-family: var(--yst-font-mono, monospace);
}
.b64-stat-success {
    background: rgba(0, 158, 148, 0.06);
    border-color: rgba(0, 158, 148, 0.2);
}

/* -------- 操作按钮组 -------- */
.b64-actions {
    display: flex;
    gap: 8px;
}
.b64-actions .yst-btn {
    flex: 1;
}
.b64-btn-danger {
    color: var(--yst-danger, #dc2626) !important;
    border-color: rgba(220, 38, 38, 0.3) !important;
}
.b64-btn-danger:hover {
    background: rgba(220, 38, 38, 0.08) !important;
    color: var(--yst-danger, #dc2626) !important;
    border-color: var(--yst-danger, #dc2626) !important;
}

/* -------- 信息卡 -------- */
.b64-info {
    padding: 18px 22px;
}
.b64-feature h3 {
    font: 700 14px/1.4 var(--yst-font);
    letter-spacing: var(--yst-letter-spacing);
    color: var(--yst-text);
    margin: 0 0 6px;
    position: relative;
    padding-left: 12px;
}
.b64-feature h3::before {
    content: "";
    position: absolute;
    left: 0; top: 5px; bottom: 5px;
    width: 3px;
    background: var(--yst-brand);
    border-radius: 0 2px 2px 0;
}
.b64-feature p {
    font: 13px/1.6 var(--yst-font);
    color: var(--yst-text-2);
    letter-spacing: var(--yst-letter-spacing);
    margin: 0;
}
.b64-info code {
    padding: 1px 6px;
    background: var(--yst-bg-subtle);
    border: 1px solid var(--yst-border);
    border-radius: 3px;
    font: 12px var(--yst-font-mono, monospace);
    color: var(--yst-brand);
}

/* -------- Toast -------- */
.b64-toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 22px;
    border-radius: 999px;
    background: var(--yst-text);
    color: #fff;
    font: 600 13px var(--yst-font);
    letter-spacing: var(--yst-letter-spacing);
    box-shadow: 0 8px 20px rgba(15,23,42,0.25);
    z-index: 9999;
}
.b64-toast-success {
    background: var(--yst-brand);
    box-shadow: 0 8px 20px rgba(0, 158, 148, 0.32);
}
.b64-toast-error {
    background: var(--yst-danger, #dc2626);
    box-shadow: 0 8px 20px rgba(220, 38, 38, 0.32);
}
.b64-fade-enter-active,
.b64-fade-leave-active {
    transition: opacity .25s, transform .25s;
}
.b64-fade-enter-from,
.b64-fade-leave-to {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
}

/* -------- 移动端 -------- */
@media (max-width: 768px) {
    .b64-page-title { font-size: 22px; }
    .b64-format-card, .b64-section, .b64-info { padding: 14px 14px; }
    .b64-fmt-btn { height: 32px; padding: 0 12px; font-size: 12px; }
    .b64-pane { min-height: 280px; }
}